diff options
| author | Markus Metzger <markus.t.metzger@intel.com> | 2009-09-15 07:00:23 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-18 14:43:20 -0400 |
| commit | 5622f295b53fb60dbf9bed3e2c89d182490a8b7f (patch) | |
| tree | 8279554bddd1607d53dc06e97f4b5a1d0c085ccd /kernel/posix-cpu-timers.c | |
| parent | 4b77a7297795229eca96c41e1709a3c87909fabe (diff) | |
x86, perf_counter, bts: Optimize BTS overflow handling
Draining the BTS buffer on a buffer overflow interrupt takes too
long resulting in a kernel lockup when tracing the kernel.
Restructure perf_counter sampling into sample creation and sample
output.
Prepare a single reference sample for BTS sampling and update the
from and to address fields when draining the BTS buffer. Drain the
entire BTS buffer between a single perf_output_begin() /
perf_output_end() pair.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090915130023.A16204@sedona.ch.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/posix-cpu-timers.c')
0 files changed, 0 insertions, 0 deletions